Fill

 A placed Fill
A placed Fill

A fill is a rectangular object that can be placed on any layer. When placed on a signal layer, a fill becomes an area of solid copper that can be used to provide shielding or to carry large currents. Fills of varying sizes can be combined to cover irregularly shaped areas and can also be combined with track or arc segments and be connected to a net.

Fills also can be placed on non-electrical layers. For example, place a fill on the Keep-Out layer to designate a 'no-go' area for auto-routing. Place a fill on a Power Plane, Solder Mask or Paste Mask layer to create a void on that layer. In the PCB Library Editor, fills can be used to define component footprints.